| Marks |
5 - 7 |
8 - 10 |
11 - 13 |
14 - 16 |
17 - 19 |
20 - 22 |
| Frequency |
4 |
7 |
26 |
41 |
14 |
8 |
The table above shows the marks obtained by 100 pupils in a test. Find the upper class boundary of the class containing the third quartile.
The third quartile can be found in the \((\frac{3N}{4})^{th}\) position
= \((\frac{3 \times 100}{4})^{th}\) position
This is found in the class 14 - 16.
The upper class boundary = 16.5